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2. Pitometer log - Wikipedia

   en.wikipedia.org/wiki/Pitometer_log

   However, most GPS receivers can automatically derive velocity and direction from two or more position measurements. The disadvantage of this principle is that changes in speed or direction can only be computed with a delay, and that derived direction becomes inaccurate when the distance travelled between two position measurements drops below or ...

3. B&G - Wikipedia

   en.wikipedia.org/wiki/B&G

   Over the course of the 1950s, B&G, then based in Lymington on the south coast of England, extended its activities into echo sounders and in 1960 produced its first speedometer. In 1966 the ketch Gypsy Moth IV , the yacht which earned Sir Francis Chichester his single-handed circumnavigation record, was equipped with a full suite of B&G instruments.

4. Submarine navigation - Wikipedia

   en.wikipedia.org/wiki/Submarine_navigation

   Surfaced submarines entering and leaving port navigate similarly to traditional ships but with a few extra considerations because most of the boat rides below the waterline, making them hard for other vessels to see and identify. Submarines carry an inertial navigation system, which measures the boat’s motion and constantly updates position ...

5. Satellite navigation software - Wikipedia

   en.wikipedia.org/wiki/Satellite_navigation_software

   In addition, marine navigation software often has option to control external autopilot for automated boat navigation. It may incorporate GRIB weather overlay on the chart, Tide predictions and other related information services of additional use to mariners. Free open source marine navigation software. OpenCPN (Cross-platform) open source and free

6. List of sensors - Wikipedia

   en.wikipedia.org/wiki/List_of_sensors

   Accelerometer; Auxanometer; Capacitive displacement sensor; Capacitive sensing; Displacement sensor (general article); Flex sensor; Free fall sensor; Gravimeter ...

7. Speedometer - Wikipedia

   en.wikipedia.org/wiki/Speedometer

   Other vehicles may use devices analogous to the speedometer with different means of sensing speed, eg. boats use a pit log, while aircraft use an airspeed indicator. Charles Babbage is credited with creating an early type of a speedometer, which was usually fitted to locomotives. [2]